/******************************************************************************\
 * Technische Universitaet Darmstadt, Institut fuer Nachrichtentechnik
 * Copyright (c) 2001
 *
 * Author(s):
 *	Volker Fischer
 *
 * Description:
 *	See OFDM.cpp
 *
 ******************************************************************************
 *
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation; either version 2 of the License, or (at your option) any later 
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT 
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more 
 * details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
\******************************************************************************/

#if !defined(OFDM_H__3B0BA660_CA63_4344_BB2B_23E7A0D31912__INCLUDED_)
#define OFDM_H__3B0BA660_CA63_4344_BB2B_23E7A0D31912__INCLUDED_

#include "Parameter.h"
#include "util/Modul.h"

#ifdef HAVE_DFFTW_H
# include <dfftw.h>
#else
# include <fftw.h>
#endif


/* Definitions ****************************************************************/
/* Time constant for IIR averaging of PSD estimation */
#define TICONST_PSD_EST_OFDM			((CReal) 1.0) /* sec */


/* Classes ********************************************************************/
class COFDMModulation : public CTransmitterModul<_COMPLEX, _COMPLEX>
{
public:
	COFDMModulation() : rDefCarOffset((_REAL) VIRTUAL_INTERMED_FREQ) {}
	virtual ~COFDMModulation() {}

	void SetCarOffset(const _REAL rNewCarOffset)
		{rDefCarOffset = rNewCarOffset;}

protected:
	CFftPlans				FftPlan;

	CComplexVector			veccFFTInput;
	CComplexVector			veccFFTOutput;

	int						iShiftedKmin;
	int						iEndIndex;
	int						iDFTSize;
	int						iGuardSize;

	_COMPLEX				cCurExp;
	_COMPLEX				cExpStep;
	_REAL					rDefCarOffset;

	virtual void InitInternal(CParameter& TransmParam);
	virtual void ProcessDataInternal(CParameter& TransmParam);
};

class COFDMDemodulation : public CReceiverModul<_COMPLEX, _COMPLEX>
{
public:
	/* bUseRecFilter shall be set the FALSE as default since in case of
	   BERIDEAL simulations, no filter shall be applied */
	COFDMDemodulation() : iLenPowSpec(0) {}
	virtual ~COFDMDemodulation() {}

	void GetPowDenSpec(CVector<_REAL>& vecrData, CVector<_REAL>& vecrScale);

protected:
	CFftPlans				FftPlan;
	CComplexVector			veccFFTInput;
	CComplexVector			veccFFTOutput;

	CVector<_REAL>			vecrPowSpec;
	int						iLenPowSpec;

	int						iShiftedKmin;
	int						iShiftedKmax;
	int						iDFTSize;
	int						iGuardSize;
	int						iNumCarrier;

	CReal					rLamPSD;


	virtual void InitInternal(CParameter& ReceiverParam);
	virtual void ProcessDataInternal(CParameter& ReceiverParam);
};

class COFDMDemodSimulation :
	public CSimulationModul<CChanSimDataMod, _COMPLEX, CChanSimDataDemod>
{
public:
	COFDMDemodSimulation() {}
	virtual ~COFDMDemodSimulation() {}

protected:
	CFftPlans				FftPlan;
	CComplexVector			veccFFTInput;
	CComplexVector			veccFFTOutput;

	int						iStartPointGuardRemov;

	int						iShiftedKmin;
	int						iShiftedKmax;
	int						iDFTSize;
	int						iGuardSize;
	int						iNumCarrier;
	int						iSymbolBlockSize;
	int						iSymbolCounterTiSy;
	int						iNumSymPerFrame;

	int						iNumTapsChan;

	virtual void InitInternal(CParameter& ReceiverParam);
	virtual void ProcessDataInternal(CParameter& ReceiverParam);
};


#endif // !defined(OFDM_H__3B0BA660_CA63_4344_BB2B_23E7A0D31912__INCLUDED_)
